Updated parser to accept underscores in variable names

app/imports/parser/grammar.js

@@ -23,7 +23,7 @@ function id(x) { return x[0]; }
       value: s => s.slice(1, -1),
     },
     name: {
-      match: /[a-zA-Z]+\w*?/,
+      match: /[a-zA-Z_]+/,
       type: moo.keywords({
         'keywords': ['d'],
       }),

app/imports/parser/grammar.ne

@@ -21,7 +21,7 @@
       value: s => s.slice(1, -1),
     },
     name: {
-      match: /[a-zA-Z]+\w*?/,
+      match: /[a-zA-Z_]+/,
       type: moo.keywords({
         'keywords': ['d'],
       }),